I wanted to know how to delete files when we don’t want them. Like sometimes users upload large size files and upload multiple copies of the same file. How can I delete the repeatedly uploaded items and keep my disk space clean? We run a blogging community forum at http://ask.mybloggertricks.com and we often need to upload graphic images and some css files
There is no way to delete files from the UI currently.
There is a cleanup task that automatically removes images which are no longer referenced in any Discourse post. It’s something @zogstrip added a year+ ago.
That is weird but at least I am glad the cleanup task exists. Images and uploaded files are an important part of community activity and there should have been a better control system for it.
Why is it weird? If an image is not displayed in any posts, why should it exist in the filesystem? Who will view it, and how?
You are right for images but what about js files. We sometimes need to host files at our forum and then link to them from </head> tag
That’d be a very risky use of uploads, since you would be allowing all users to upload javascript files that your site would then execute.
I … can’t … say I would recommend that.
That is right but we upload the js ourselves and have not given rights to anyone else. We disable the js upload as soon as we are done uploading some front-end js files.
Then make sure a hidden staff post links to the files. (There is a private staff category in every install.) And you should be fine.
I have just one new question in mind that is troubling me.
How does Discourse handles illegal hosting done by users using the PM system? What if a user uploads large files via PM and then links to it from an external source. Will cleanup task delete them or not?
Good question! Illegal activity in Messages is another reason admins need visibility into them, cc: @downey.
There is not a way at the moment to browse the largest file uploads but that would be a good thing to have eventually.
I am glad you agreed here. I will be more than pleased to have this option added in future updates 
“Illegal” is going to depend on the jurisdiction. For example, in the United States, the Online Copyright Infringement Liability Limitation Act provides safe harbor for service providers (such as someone running a Discourse site) against actions of their users. As long as the service provider responds to notice of infringing activity, and can produce good records of what that user did or did not do (emphasis hint for @codinghorror), and how they responded to that user and that user’s infringing content, then they are generally not liable for those actions.
In other words, it may not (or may, depending on where you are) be the job of the service provider to police and snoop on its users’ activities.
Sure, Nginx or Apache server logs would exist in all cases for all websites. So you are covered. This is real basic web stuff.
Whether the uploads are illegal or not, the site owner might not appreciate a user who signs up, achieves trust level 1 (necessary to message at all) and then posts 1 GB of files per day in PMs.
Still no such feature? How can I remove uploaded image?
Uploaded files that aren’t used anywhere are automatically removed.
Are you talking about an image that is used somewhere?
This are a good news, thank you. Can I delete 'em manually?
Pour éviter toute ambiguïté, lorsqu’un message est modifié et que la seule instance d’une image ou d’une image liée Dropbox est supprimée, cette image est-elle considérée comme n’étant utilisée nulle part ? Actuellement, elle reste visible lors de la consultation de l’historique des modifications, ce que je n’attendais pas.
Ce sont deux choses différentes.
Une image a été téléchargée et possède un enregistrement Upload dans la base de données.
Une « image liée via Dropbox » est un lien vers une image qui est « servie » aux clients (navigateurs) par Dropbox.
Le nettoyage automatisé ne concerne que les images téléchargées, pas les images liées.
Donc, une image avec un enregistrement upload qui n’a jamais été publiée ou qui a été retirée d’un commentaire serait automatiquement supprimée. C’est bien cela ?
edited.png
Le fichier PNG ci-dessus provient d’un lien Dropbox. D’après mon expérience précédente avec un fichier .gif, lorsque le lien sous-jacent était supprimé, l’image restait dans le commentaire. Si je modifiais le message et retirais le lien, l’image persistait dans la version originale du message. Ce message sera modifié, donc j’espère qu’il illustre bien ce que je veux dire !
Cela ne semble pas être « servi », mais plutôt « téléchargé ». Ce n’est pas le cas ?
Modification n°2
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J’ai supprimé le lien côté Dropbox et il a immédiatement cessé d’être visible dans le message.
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J’ai réactivé le lien, puis j’ai modifié le message pour retirer le lien, mais dans un autre navigateur, je n’ai pas pu consulter les anciennes versions du message — il n’y a pas de crayon — pour tester ceci :
Si je modifiais le message et retirais le lien, l’image persistait dans la version originale du message.
Le comportement décrit au point 1 contredit le message ici. Si vous examinez l’historique des premières modifications du message, vous y verrez un fichier .gif. Le lien sous-jacent ne fonctionne plus et le message ne l’affiche plus, ce qui me laisse perplexe face à ces différences.